Subjects will be asked to complete psychosocial questionnaires that measure variables known to be associated with COPD and with positive responses to exercise interventions. Measures will include the 21-item BDI-II to assess depressive symptoms, the 16-item ASI to assess anxiety and the SES to assess patients' confidence in their ability to successfully perform certain behaviours (e.g., exercise). In addition, the Primary Care Evaluation of Mental Disorders will be administered to characterize subjects and to detect the most common Diagnostic and Statistical Manual-IV disorders in primary care settings. Dr. Lavoie will be in charge of administering psychological questionnaires and will ensure that patients who score in the clinical range are properly referred and followed.